There should still be one built-in. That slot is for any future upgrades, if necessary. For instance, the Smart Card built inside the Hopper 3 is likely a G4 model. (The white Smart Card, if it were a separate card.) If Dish ever feels the need to upgrade it to the new G6 Smart Card (the green one) then they would send one to put in that slot. The G4 Smart Card will still work for now, though. In fact, I am still using receivers that have the even older G3 (purple) Smart Card.